Plasma cutting shielding cover

Abstract

The utility model relates to a plasma cutting shielding case, which belongs to the technical field of plasma cutting and comprises a hollow shielding case body, the shielding case body comprises a far end and a near end, the far end of the shielding case body is provided with a jet hole, an insulator is provided with a plurality of vortex holes with certain angles, and the vortex holes are communicated with the jet hole. The plurality of vortex holes are uniformly distributed in the circumferential direction by taking the axis of the insulator as the center, one end of each vortex hole is positioned on the inner edge surface of the insulator, the other end of each vortex hole is positioned on the outer edge surface of the insulator, a cavity is formed between the outer edge surface of the insulator and the inner surface of the shielding case body, and the vortex holes are communicated with the cavity; according to the utility model, the baffle plate which is opposite to the inclination direction of the vortex hole is arranged on the insulator, so that torque generated on the insulator when protective gas flows in the vortex hole can be offset, relative rotation between the insulator and the shielding case body is avoided, and the connection stability between the insulator and the shielding case body is improved.

Description

Technical Field

[0001] This utility model relates to a plasma cutting shield, belonging to the field of plasma cutting technology. Background Technology

[0002] The basic components of a standard precision plasma cutting torch include: a torch body, water pipe, electrode, nozzle, vortex ring, inner fixed cover with vortex generator, outer fixed cover, and shielding cover. The water pipe is installed inside the torch body. The electrode, nozzle, vortex ring, and inner fixed cover are sequentially fitted over the preceding component and mounted on the torch body. The shielding cover is fitted over the inner fixed cover, and the outer fixed cover is fitted over the shielding cover and mounted on the torch body. The plasma cutting torch is connected to a power supply and gas control console via pipelines. When the power is turned on, the electrical control of the power circuit board forms a guiding arc between the electrode and nozzle, which is transferred to the metal material being cut, generating a plasma arc. This arc cuts the metal material as the CNC machine tool moves. During this process, the plasma arc concentrates at the center of the electrode and, following the flow direction of the plasma gas, passes sequentially through the nozzle passage holes and the shielding cover passage holes to reach the metal being cut. The temperature of a plasma arc can reach over 30,000℃, but the plasma gas and protective gas form a rotating vortex gas through the vortex ring and vortex generator, respectively, creating a protective layer between the arc and the component passageway, thus preventing the components from melting. However, even with the cooling of the coolant, some areas of the components still experience excessively high temperatures, leading to oxidation and the natural wear we observe. Therefore, during the entire operation of the plasma system, the electrodes, nozzles, and shielding are the most susceptible to damage.

[0003] Chinese invention patent CN109848615A discloses a shielding cover with optimized air cooling and improved cutting capability. It includes a shielding cover body with a distal end and a proximal end. A jet hole is located at the distal end. A step is formed within the shielding cover body, and an annular insulator is located at the step. A ring of vortex holes is radially arranged on the annular insulator. A cavity is formed between the outer edge of the annular insulator and the inner surface of the shielding cover body, and the vortex holes communicate with the cavity. This invention provides a shielding cover with optimized air cooling and improved cutting capability. It can improve the vortex intensity of plasma gas, enhance the cooling effect, increase the service life of the shielding cover, and improve the cutting capability of the plasma torch; at the same time, it reduces the fault tolerance rate in actual use and improves production efficiency. However, in the prior art, since the insulator has a ring of uniformly arranged vortex holes with a certain angle along the radial direction, when the protective gas flows in the vortex holes, it will generate a certain torque on the insulator, which will easily cause relative rotation between the insulator and the shield body, affecting the stability of the connection between the insulator and the shield body.

[0004] Therefore, a plasma-cut shield is needed to prevent relative rotation between the insulator and the shield body, thereby improving the stability of the connection between the insulator and the shield body. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, to provide a plasma cutting shield that avoids relative rotation between the insulator and the shield body and improves the connection stability between the insulator and the shield body.

[0006] The technical solution adopted by this utility model to solve the above problems is as follows: a plasma cutting shield, including a hollow shield body, the shield body including a distal end and a proximal end, a jet hole is provided at the distal end of the shield body, a plurality of vortex holes with a certain angle are provided on the insulator, the plurality of vortex holes are evenly distributed circumferentially around the axis of the insulator, one end of the vortex hole is located on the inner edge surface of the insulator, the other end of the vortex hole is located on the outer edge surface of the insulator, a cavity is formed between the outer edge surface of the insulator and the inner surface of the shield body, the vortex holes are connected to the cavity, an annular groove is provided on the outer edge surface of the insulator, the annular groove is coaxially arranged with the insulator, the annular groove is connected to the cavity, a plurality of baffles are provided in the annular groove, the plurality of baffles correspond one-to-one with the plurality of vortex holes, the plurality of baffles and vortex holes are staggered, the baffles are inclined, the inclination direction of the baffles is opposite to the inclination direction of the vortex holes.

[0007] Preferably, the tilt angle of the baffle is equal to the tilt angle of the vortex hole.

[0008] Preferably, a plug is provided on the side of the insulator near the far end of the shield body, and a plug hole is provided at the step position of the shield body. The plug hole is a blind hole, and the plug is inserted into the plug hole, and the plug is sealed to the inner peripheral wall of the plug hole.

[0009] Preferably, multiple insertion rods and insertion holes are provided, with multiple insertion holes corresponding one-to-one with multiple insertion rods, and multiple insertion rods are distributed circumferentially around the insulator.

[0010] Preferably, a circular hole is provided on the side of the insertion hole near the distal end, the circular hole extending to the distal end, a connecting tube is inserted into the injection hole, the connecting tube is threaded and sealed to the inner peripheral wall of the injection hole, a sealing ring is provided on the outer peripheral wall of the connecting tube, the sealing ring fits against the distal end, and the circular hole is sealed by the sealing ring, and a through hole is provided at the end of the insertion rod near the distal end, the through hole extending to the annular groove.

[0011] Preferably, the connecting pipe and the sealing ring are integrally formed.

[0012] Preferably, the shield body further includes a conical outer surface, and a seal is provided between the conical outer surface and the proximal end.

[0013] Preferably, the sealing element is an O-ring.

[0014] Preferably, the shielding cover body is frustum-shaped, with the distal end being the small-diameter end of the shielding cover body and the proximal end being the large-diameter end of the shielding cover body.

[0015] Preferably, the shielding cover body has a step, and the insulator is located at the step.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This utility model discloses a plasma cutting shield. By setting a baffle on the insulator with the inclination direction opposite to that of the vortex hole, the torque generated on the insulator when the protective gas flows in the vortex hole can be counteracted, avoiding relative rotation between the insulator and the shield body, and improving the connection stability between the insulator and the shield body. Moreover, the cooperation between the plug and the plug hole further improves the connection stability between the insulator and the shield body. At the same time, by adjusting the distance between the sealing ring and the far end, the protective gas can flow in the circular hole, which facilitates the heat dissipation of the shield body with the airflow, thus improving the heat dissipation effect of the shield body. Attached Figure Description

[0018] Figure 1 This is a perspective view of a plasma cutting shield according to the present invention;

[0019] Figure 2 This is a front view of a plasma cutting shield according to the present invention;

[0020] Figure 3 This is a top view of a plasma cutting shield according to the present invention;

[0021] Figure 4 This is a left view of a plasma cutting shield according to the present invention;

[0022] Figure 5 This is a cross-sectional view of a plasma cutting shield according to the present invention;

[0023] Figure 6 for Figure 5 Enlarged view of part A;

[0024] Figure 7 This is a left view of the shielding cover body;

[0025] Figure 8 This is a cross-sectional view of the shielding cover body;

[0026] Figure 9 A three-dimensional diagram of an insulator;

[0027] Figure 10 This is the front view of the insulator;

[0028] Figure 11 This is a cross-sectional view of an insulator;

[0029] Figure 12 for Figure 11 Enlarged view of part B;

[0030] Figure 13 This is a schematic diagram of the connection structure between the connecting pipe and the sealing ring.

[0031] The components include: shield body 1, far end 2, near end 3, jet hole 4, insulator 5, eddy hole 6, chamber 7, annular groove 8, baffle 9, insertion rod 10, insertion hole 11, round hole 12, connecting pipe 13, through hole 14, sealing ring 15, conical outer surface 16, and sealing element 17. Detailed Implementation

[0032] like Figure 1-13 As shown, a plasma cutting shield in this embodiment includes a hollow shield body 1, which is frustum-shaped. The shield body 1 includes a distal end 2 and a proximal end 3, wherein the distal end 2 is the small-diameter end of the shield body 1, and the proximal end 3 is the large-diameter end of the shield body 1. A jet hole 4 is provided at the distal end 2 of the shield body 1. A step is provided inside the shield body 1, and an annular insulator 5 is fixedly provided at the step position of the shield body 1. The insulator 5 is made of a non-conductive but thermally conductive material, such as polyimide or ceramic. Multiple [unclear text - likely referring to markings or markings] are provided on the insulator 5. A certain angle vortex hole 6, multiple vortex holes 6 are evenly distributed circumferentially around the axis of the insulator 5. One end of the vortex hole 6 is located on the inner edge surface of the insulator 5, and the other end of the vortex hole 6 is located on the outer edge surface of the insulator 5. A cavity 7 is formed between the outer edge surface of the insulator 5 and the inner surface of the shield body 1. The vortex hole 6 is connected to the cavity 7. When the protective gas reaches the cavity 7 through other accessories of the cutting torch, the gas is stored here. On the one hand, the high-pressure cold gas can continuously cool the shield body. On the other hand, the protective gas stored here passes through the vortex hole 6 more stably, forming a stable vortex gas, which is then ejected from the injection hole 4.

[0033] An annular groove 8 is provided on the outer edge surface of the insulator 5. The annular groove 8 is coaxially arranged with the insulator 5 and communicates with the chamber 7. Multiple baffles 9 are provided in the annular groove 8. The multiple baffles 9 correspond one-to-one with multiple vortex holes 6. The multiple baffles 9 and vortex holes 6 are staggered. The baffles 9 are arranged at an inclination angle. The inclination angle of the baffles 9 is equal to the inclination angle of the vortex holes 6. The inclination direction of the baffles 9 is opposite to the inclination direction of the vortex holes 6. The protective gas in the chamber 7 first enters the annular groove 8 and then enters the vortex holes 6. The torque generated by the protective gas on the insulator 5 when flowing in the annular groove 8 is opposite to and cancels out the torque generated by the protective gas on the insulator 5 when flowing in the vortex holes 6. In this way, relative rotation between the insulator 5 and the shield body 1 can be avoided, and the connection stability between the insulator 5 and the shield body 1 can be improved.

[0034] Multiple insertion rods 10 are provided on the side of the insulator 5 near the far end 2 of the shield body 1. The multiple insertion rods 10 are evenly distributed circumferentially around the insulator 5. Multiple insertion holes 11 are provided at the step position of the shield body 1. The insertion holes 11 are blind holes. The multiple insertion holes 11 correspond one-to-one with the multiple insertion rods 10. The insertion rods 10 are inserted into the insertion holes 11. The insertion rods 10 are sealed to the inner circumferential wall of the insertion holes 11. Through the cooperation between the insertion rods 10 and the insertion holes 11, the connection stability between the insulator 5 and the shield body 1 is further improved.

[0035] A circular hole 12 is provided on the side of the insertion hole 11 near the distal end 2, and the circular hole 12 extends to the distal end 2. A connecting tube 13 is inserted into the injection hole 4. The connecting tube 13 is threaded and sealed to the inner peripheral wall of the injection hole 4. A sealing ring 15 is provided on the outer peripheral wall of the connecting tube 13. The sealing ring 15 fits against the distal end 2 and seals the circular hole 12 through the sealing ring 15. A through hole 14 is provided at the end of the insertion rod 10 near the distal end 2, and the through hole 14 extends to the annular groove 8.

[0036] The connecting pipe 13 and the sealing ring 15 are integrally formed;

[0037] When ensuring that the flow rate of the protective gas discharged from the vortex hole 6 meets the working requirements, rotate the connecting pipe 13 to move the sealing ring 15 and separate the sealing ring 15 from the distal end 2. At this time, part of the protective gas in the annular groove 8 enters the vortex hole 6, and the other part of the protective gas in the annular groove 8 is successively transported from the through hole 14 and the insertion hole 11 to the circular hole 12. The protective gas in the circular hole 12 is then discharged from the distal end 2. The flow of the protective gas in the circular hole 12 can improve the heat dissipation effect of the shield body 1. In addition, by adjusting the distance between the sealing ring 15 and the distal end 2, the flow rate of the protective gas discharged from the circular hole 12 can be adjusted, that is, the flow rate of the protective gas entering the vortex hole 6 can be adjusted, so as to meet the flow rate requirements of the protective gas discharged from the vortex hole 6.

[0038] The shield body 1 also includes a conical outer surface 16, and a sealing element 17 is provided between the conical outer surface 16 and the proximal end 3. The sealing element 17 is an O-ring.

[0039] In summary, by setting a baffle 9 on the insulator 5 with an inclination direction opposite to that of the vortex hole 6, the torque generated on the insulator 5 when the protective gas flows in the vortex hole 6 can be counteracted, preventing relative rotation between the insulator 5 and the shield body 1, and improving the connection stability between the insulator 5 and the shield body 1. Moreover, the connection stability between the insulator 5 and the shield body 1 is further improved by the cooperation between the insertion rod 10 and the insertion hole 11. At the same time, by adjusting the distance between the sealing ring 15 and the far end 2, the protective gas can flow in the circular hole 12, which facilitates the discharge of heat from the shield body 1 with the airflow, thus improving the heat dissipation effect of the shield body 1.

[0040] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A plasma cutting shield, comprising a hollow shield body (1), the shield body (1) comprising a distal end (2) and a proximal end (3), wherein a jet hole (4) is provided at the distal end (2) of the shield body (1), an insulator (5) is provided inside the shield body (1), and a plurality of vortex holes (6) with a certain angle are provided on the insulator (5), the plurality of vortex holes (6) being evenly distributed circumferentially around the axis of the insulator (5), one end of the vortex hole (6) being located on the inner edge surface of the insulator (5), and the other end of the vortex hole (6) being located on the outer edge surface of the insulator (5), wherein a cavity (7) is formed between the outer edge surface of the insulator (5) and the inner surface of the shield body (1), and the vortex hole (6) is connected to the cavity (7), characterized in that: An annular groove (8) is provided on the outer edge surface of the insulator (5). The annular groove (8) is coaxially arranged with the insulator (5). The annular groove (8) is connected to the chamber (7). Multiple baffles (9) are provided in the annular groove (8). The multiple baffles (9) correspond one-to-one with multiple vortex holes (6). The multiple baffles (9) and vortex holes (6) are staggered. The baffles (9) are arranged at an angle. The angle of the baffles (9) is opposite to the angle of the vortex holes (6).

2. The plasma cutting shield according to claim 1, characterized in that: The tilt angle of the baffle (9) is equal to the tilt angle of the vortex hole (6).

3. The plasma cutting shield according to claim 1, characterized in that: A plug rod (10) is provided on the side of the insulator (5) near the far end (2) of the shield body (1). A plug hole (11) is provided at the step position of the shield body (1). The plug hole (11) is a blind hole. The plug rod (10) is inserted into the plug hole (11). The plug rod (10) is sealed to the inner peripheral wall of the plug hole (11).

4. A plasma cutting shield according to claim 3, characterized in that: The insertion rod (10) and the insertion hole (11) are provided in multiple ways. The multiple insertion holes (11) correspond one-to-one with the multiple insertion rods (10). The multiple insertion rods (10) are distributed circumferentially around the insulator (5).

5. A plasma cutting shield according to claim 3 or 4, characterized in that: A circular hole (12) is provided on the side of the insertion hole (11) near the distal end (2), the circular hole (12) extends to the distal end (2), a connecting tube (13) is inserted into the injection hole (4), the connecting tube (13) is threaded and sealed to the inner peripheral wall of the injection hole (4), a sealing ring (15) is provided on the outer peripheral wall of the connecting tube (13), the sealing ring (15) fits against the distal end (2), and the sealing of the circular hole (12) is achieved by the sealing ring (15), and a through hole (14) is provided on the end of the insertion rod (10) near the distal end (2), the through hole (14) extends to the annular groove (8).

6. A plasma cutting shield according to claim 5, characterized in that: The connecting pipe (13) and the sealing ring (15) are integrally formed.

7. A plasma cutting shield according to claim 1, characterized in that: The shield body (1) also includes a conical outer surface (16), and a seal (17) is provided between the conical outer surface (16) and the proximal end (3).

8. A plasma cutting shield according to claim 7, characterized in that: The sealing element (17) is an O-ring.

9. A plasma cutting shield according to claim 1, characterized in that: The shield body (1) is frustum shaped, the far end (2) is the small diameter end of the shield body (1), and the near end (3) is the large diameter end of the shield body (1).

10. A plasma cutting shield according to claim 1, characterized in that: The shield body (1) has a step inside, and the insulator (5) is located at the step.

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